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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7100692dc8052272d0e7058cd34b55a2f96464103bd56ca16ada14914c704729' 
  AND token = 'Qt4meMf/tEGutbgb/VYHx7X5Ziz7ZJHdcFEi02Tv2X8=' 
  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"
    }
  }
}