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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be9bc315c416f53149d74977feb7b231b9b4597a533ad985a5be869302989ce' 
  AND token = '6RI55GAXQ8Pvff4qIJ6d7Q0P3gt01T4Lv5UKlfWj+lg=' 
  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"
    }
  }
}