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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923f76a93187c0a3b61c11edbcf5ffb5e4d55d79b8bce9ff71e4108148233dbe' 
  AND token = 'NFyip5LSFHGw8yZHQDn8LYo4pgG4l5cs5frAVrfFfgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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