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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11721c82fd16c9af55d0ffc9ae62f669f7bc4ed53c6fc71f81e5889c3d7e35d6' 
  AND token = 'v/gTQbsUe28lHsnMoWVbhgzT2AypLlFJa6to7dZ21bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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