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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae66c24f7de055efd2543c75e26cae6884547d31c21e8e79b9f4df36fd233495' 
  AND token = 'Ghz+kSMZZ13Sb/s6dbvA+PN5SaL7UpbX9an0OspeAho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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