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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13905157e3710e575d2f38953a24b02a0b4f0f1440d23df44f65c31b2206b627' 
  AND token = '6KT4++j/UHdLLcKN+AAlvc535TOc8kefO7PlqUryfQA=' 
  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"
    }
  }
}