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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8d21e0bd6352c18eaad4b7b19373556b6caa8bbc834148972c42604095de14' 
  AND token = 'L7Iz8Ry8mu9BlWWHN2oL7rvpeNOSdlzw6ItJLDVm/3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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