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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2984c0d33b4f2f40ab648ee4e0440d245e786dfd485be96991f7085c77bade9f' 
  AND token = 'uqNt9dDO98ynTtSaIdn/hlxUGZ36KW970Vpy83/CgOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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