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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf413df7949e348d5c6440806a9bbf7d41d75f3d60c08588a74621f7002d4ce' 
  AND token = 'd1zoUQpTB5PlMmdB0ozYchph5QY0OTW7oJtixGDr07I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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