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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ac53d6c1e26e7deeba895cd95ddaf10588b027745c5fe756eb959da8b46e5f' 
  AND token = 'ZA7xFP8ZFx7JSBrozDbOi936CWHUSs3njtc4dmLHVX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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