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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1bb34c9d35c04a71c5a520d4d1affdd7c9d173ed5e7df6f7db3123fae765c3' 
  AND token = 'JR6GTOrylj1rECuq3CikcLd1wInMQS+H4cLGxoftuoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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