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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad365104b9f045201d352fbc41a93ff25b83ce92c9acfdc0e5c86a949c730af3' 
  AND token = 'nIVCXYOUnIC4nnLyV8N7a8XhecZTFgMoR14kfZX+2Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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