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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b53b670c0a91e1cef2423a0ff0f8eb803eb43677cfa8324537537bd994e338d' 
  AND token = 'tAufqUr6kw6O38hu0JBmrr09Cv9GhU7t6cYlyIMnhbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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