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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6a7d841f99de4f63a60febc4ee808494b593ef84ea5c7f35bdc6202964d6c0' 
  AND token = 'Xwz2f29RlFh/1b8G4Q90Mi4BS6AMr7F7acU7RxVrqgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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