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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17eed1c67e2be4fc746ee6d221e102cb55a04bd3a35d0056d7320b9ae0317f5b' 
  AND token = 'gtOyn8BLQlTmKPMqQIeB3tWfK1v4qVZBS9bRLJ7B8NM=' 
  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"
    }
  }
}