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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd14c76134ad30bba987ba80c3d50e22c924f7a66c618de1c7718d7c5950c9c' 
  AND token = 'qPTdUnO0I1zCBmWTFQtxW7kv/gSYEFauCE/uZVKCnQk=' 
  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"
    }
  }
}