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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d4b5d649d0cd9d9fd893a4e86c026e7eb75fe7362482e405c63073893b8bae' 
  AND token = 'pKDHVG3z5tYcU4rfPbBwy7Wy1wLQwhn5t1rz1NTj388=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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