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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca80ad673373e51cef92e205c08aeaf33d2ed9427657b17425bca80ea2c5a25' 
  AND token = 'cut9v60aPWqw5X0qXRaAMu5I08rota7PgyoYxso+PI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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