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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c2b11f4471eafcbdf0a4904b3da9a4f8bf0a7ba008cf79709a87ce89fe101a' 
  AND token = 'hasSlz2Qnfp0WTIrCN/JiTxyg6DwB6h03/tk7+FjNm0=' 
  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"
    }
  }
}