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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c7d8ebaef241a11bb927f6572ace088ef2ff09981ae5e9c4cff0ec562d97e9' 
  AND token = 'YIrq21VMuNqTUTXk9d+ZkOHoiAAHspcAUQnf6S0/AVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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