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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0829109af5dbabc5678ea7975739e74ce9300927516b6644e2d9f4cc7387ac99' 
  AND token = '+yp817f40NYHSx0ZsfECAkei90fsUNdZT1Jh9gmRVv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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