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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efcc7ff923efdb1cbf18c2cea2e38f1d0ac3cf5482a626012eca910f6c171aa' 
  AND token = '9HxEEOkG/EMJBb1ZVmz0irbbcEpihygiGeYxZDeMuM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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