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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1436db7408290f2198bb0f12d6a338a9cdc9dec6905fd5e6894a0c762fec9f7' 
  AND token = '4gBbfX/AxPjuWaiQnuTgPmAHOoc2lEzyNVX9V9Ka6LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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