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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5423348a34647ef7b2ee4e442a6870e6c258a66dd43cd3b913faa9b349fd78bc' 
  AND token = 'vRvImKAuH8cB1p6E8IqCgeiQHSMuC5LnaksmPbQMQ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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