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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84132d0dc907e5a9c11278f6fd11c1c7be43e41e07d5424e6cb243c987da69e9' 
  AND token = 'LGaDmUlYVm1WKHvFEMU4PZTYpPka7KhsSNoZBKY6Z5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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