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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9009983b976a4903d6cd3354461b8eceb1fbeef4d57f34461def47a5fef1811' 
  AND token = 'TtTByMJF3b+JPIEq5qcWdw3UMSb4eLY1Em8ecxGVc+g=' 
  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"
    }
  }
}