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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf242aeaa32ddf5f7424bf6f804c6c5712b6381a26cbe36666a1423c35ac3ea' 
  AND token = 'lCh57WS2hEiR0kRVgZx9KCGpgNXj8cifDepdb1Piwi8=' 
  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"
    }
  }
}