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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dad82ddb6b0e9e38b335298901fa95a0eea399f57bf068018c68ce849830ee' 
  AND token = 'CsarF+eij2FB6PWOzPP1jYB7J6RKbjr6J4EkkHsGBz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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