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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c6a22c17eaf3cc90a2f154f5d8ce08c0d796cebba9fd965bd00f966e1ced8e' 
  AND token = 's6pXMj/m1aqhNPUkaoiSSyTK6NDBdwtJEKl3MkXk9d8=' 
  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"
    }
  }
}