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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffedb59b43d9fad09a537ceab92385f675622bdead507e56666a14be2f4dbf4' 
  AND token = 'EF9cSmYK/kvB47NU/ddVxYsYxkUyhX02rOwj0d/N5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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