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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a7d9810f6ea6b44f7ca28046486845211c2f331ec253cd1a14f5147ff0054c' 
  AND token = 'EJFWPdWi8zbNq5WaDz1tG0FDO2BWWFWEbU+8C592do8=' 
  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"
    }
  }
}