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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deba23df3eef5a8b4b5c797cccc9ac74d3c4341a84805b6b8dfef7ba3c1a21c8' 
  AND token = 'Q3w0dDwStdZHKshbNU2UH/YaMhcSB10rxGbfIPSK2/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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