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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b842fb52061cad31cdcc4e20c9f59e05197c720291598af0d1b1451fd505ad5' 
  AND token = 'CUHacHkPQVKUBtxwTF1Y7i4rCt0DNszr557btvA+tp8=' 
  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"
    }
  }
}