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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fda8199e3c7f42735216d1bb370e0d31da2c705256bdd3e6515754a8c75779' 
  AND token = 'x0eMjgKd5oInKgFNocp3pAS/JNT4EpzqOg5jtXiC7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}