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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6f7936b280f6ad2052ed6f902b7b4a5dff6277a4e759136ab61339de4e2cf0' 
  AND token = 'FsjPN1d/I+yHJb9iZr7IU8ZWnCHXrUPt9CSRL/Up1/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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