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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd923e77863d50a18a7e8c256abae5d1bde2b10fa83d1df73dfd136bedaae2ffe' 
  AND token = '+/0Uc9rvrwG8VeRVMO9l9w1GTZQes9XTvtvW22Qvh8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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