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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9484212f5b634251f11a33312db32b72b931f06335028189c6e5a7a257cc0a5d' 
  AND token = 'Py3jFehOYBg8B6RG++1fwH6A4ci4iVocwZQ1Cn8yEEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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