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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692bd82661fec37a98887a8e89065184c5cb1b5356a9a83cbb45ef97204b7b2f' 
  AND token = '68znT+/7akBqU8Fr6ONlRo/p+seMe4GEjYKaOH9F3Jk=' 
  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"
    }
  }
}