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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4192890bee20d5540999576c00fa5994e67a516110a44f760f3776713fe878' 
  AND token = 'SyM/G+4eyT6qx6x1c60uEoqKKV+qqO40Bg66GGDoccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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