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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d40e13e6fdca26c7d347400739f682615241b5e5ba8823d8db0da2206dfd4b' 
  AND token = '5RDxjmS0Ew8oda3SfDM4pOszcNlFMq0wxlbnkSpbj3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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