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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485cab2398c0c573e3e3e0c61a99a1f3ea11ff4ad30ff260535e9fc03ec5cdbf' 
  AND token = 'IDiwXzbhx6wiXsGJk8PLslfF1BiC1omUKBUorYfvy74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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