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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc36a5a8b9eb8fa50edf4b825d2545e6d1bdd675086fa25134bcbb361e95b24' 
  AND token = 'Xf1L8EyyX3n76WB3gPrJjOq99qwW2Wm/XCx00Wt8bXs=' 
  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"
    }
  }
}