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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524d03de61c7f37baf5fdb938c0ef6a26d65af8c376fc4a27fae76e442c49da0' 
  AND token = 'gafNmrwJcMO8QSqcP6kR0UmchJcIKMFyRFKWTfePFMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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