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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7384411e867b81f3771705111f83575810619a66e29a5633fd463a22bf9e08' 
  AND token = '3k2QJpRj5Psl41juUkO+3LYnlHNcdj9YDA+7QfoAFLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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