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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b96fe84515f8812f592c518317fe1b1fdf521eb7c343976ac1b560f79e3a43b' 
  AND token = 'LBp1DVmP/8y3jxpp2Atv02XLh8kg0NsKiyaqai91c8Q=' 
  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"
    }
  }
}