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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5066e04454b3eebac6ce62c04e4ff4c60f9f71b4e4f0718f6fe7fc21c2f2c7' 
  AND token = '+ToT6GI3pG2+q8foj4KOkWk1Q6sdqjrMzjKu7dAAMiQ=' 
  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"
    }
  }
}