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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b42342a356ba889f7a740f082d156a21da3f11cf76e97b01e6ec7101b30980' 
  AND token = 'W8U5fJXVcPCybHzfaKQtpDm85lqtsp/ubEQLaI4a7fM=' 
  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"
    }
  }
}