SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd475ccb7793e458c465784c8b4fa47eb12ed2f8357b714849c1f980cd04a6595' 
  AND token = '4Dlxbx5y+/3JgKVPfpRPhUqY7C2kmsI5Ls14rmzjw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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