SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e961fceb02711acfc1e27af0a5d5c719a9cfc1119c572344c90acb6ad908b79' 
  AND token = 'bvZpxCa1z/uf0URqvVldVJb+IgOh3kwCEv4+PDLKdFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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