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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085e6d76c471ddb988b1cc4318ed51bf44bbd30a40fb1c3abb25a294346b43d1' 
  AND token = 'v9hTVgdcqXrgrNtVPntTdGfvu9qye0skJx8h7MbuUFE=' 
  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"
    }
  }
}