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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df5e3ec93b473112b2d8b8dd64d4eda3222e7deee23179d3712486fa0888ef7' 
  AND token = 'GTI0HNQ5fbyi76Zn+i2RaZwI8AaM+k4Enqk79OI59Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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