SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa8277606f0a903c663bc4c9847bd6e60b7ad1f6a413cf64f85bdd99fe6109c' 
  AND token = 'UjJL9aRhGtnqVY5iYnG+rHD6gM1w8X2vX1BZcDn9RaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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