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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3552e5b62d10765baf0cc271c399e09a84bef9fba27fd0514edd88428893737f' 
  AND token = 'MG/He6AC4ISOofbGSKYRVJhY0FaTGM1EjSOGrMgRyiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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