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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e484e882e51b1f3d8e9e3b687aeb8f3e97a94e1fedd66d3503cb72dcdb5292f' 
  AND token = 'Bu6oLr1orr3D9NNOyArrnKc4lrv85LOCSedoU+K8T1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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