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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4ef25445425f93bfbf8a47b8f6bc118b3a14f86d048352a6c47f4d8561e873' 
  AND token = 'HASEaaVwd7amfGFxGnalSLdGrm4d7X+OolBcakGVgKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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