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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6e06b1a6b76216b51af5a701ff363ccb93c7a9984893eed5e7f7454c0fa75f' 
  AND token = 'cc1wBopVgpTNjbTITCuYPHFM2tt9zhoJbjQSxrFWwBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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