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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5bac28956c567a93363b8045cbc05e421f2641d42b713fc08033c882db81ea' 
  AND token = '3uWxH1Hvd1HmtWJur8rO9+vpFWE0nKe/m3TG/Y+k2pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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