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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53bc9ddb4621f00f41e059f5570adc8b221b1a14567d94cdab39ce9c853232c' 
  AND token = 'ipHltT3gsIpj0oXvwlDIYqMFXnjWlIHOa6lR8qBws54=' 
  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"
    }
  }
}