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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c80f5de0807abc1a4c6820299a6ad578f5011c6930aadc7b1ab9d297d58d8e1' 
  AND token = 'KnU8pox9JETxrjOuqN2LkUGg+fFaTVKRcBkurqgOMhI=' 
  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"
    }
  }
}