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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9047a8045b770732b59141f3eb7cd53049857cea06724ee9b362620cd29fce' 
  AND token = 'NDccl2g0cRBRIwD2K8D+3N/6w06LnpJXPMrY+Jc67TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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