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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bfd6a32aa85f1134ead2d699c4b7a36b135b76d121e2ed0c8d6452d38d1642' 
  AND token = 'LZHNgKHC6Ad1VK3Zc9lbipGL1lsH96T19f/M7cMhsRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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