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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e205b993e2a2fddbd792f142b8bb4865125c6ac7b2b85a988b41f67e139b23c9' 
  AND token = 'Ux/ci2DS1xuSq1r8Gi6ujmnzXB2ohQrZlSskrkSBj10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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