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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01f1a388e6377b464890772227eb7534a52009ceb5a4cbb7cdae32163995d02' 
  AND token = 'BMtyrcf4LlYbbIL9R7ulbhVJCi9BtxWp3JE2Ck+ZzkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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