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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d872f92aa1112049cd9b1501377a08470c1dc15d3f8416f08c9f861ed4e850' 
  AND token = 'v46umuQ2lzIehOv3TJS8y/LA7uUjd9mL0CINt/KbWf4=' 
  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"
    }
  }
}