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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a78800c2524c7c6ae12791fdfdde3cfe08150f091cf4b3ef265572f7c70d2ef' 
  AND token = 'zajzwc6iC9q7y7vky8zPA4s7mLv4uJMt05aQu7fShaQ=' 
  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"
    }
  }
}