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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70242ba02c5fe393ee41e7430f3ec8c8aee606be95bf1b2b719510d3108d2f61' 
  AND token = '2+Fua03n/loXg85rsfJtrlOtvz2BBd2jj4TxosNhUVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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