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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc15ecfe21ea88782690429dcf3e400995d89674853b5828020d946d84d7349' 
  AND token = 'dms8Co//7aP6CPS9n6O3jP13vQpfuQv+MH1vaIHVylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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