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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dd17ffd67509e2a2c5bc49202bb0c9b1fd6158477ce2b7c71f35d44568990f' 
  AND token = 'zdTwkE2Vhe0+CkJim2EImF6E1PWAMzvrTcOmaflnmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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