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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96cf1788d5f93191dd4eade72cd97e35b949f8983a5c4d6a4f03ffb673666b3' 
  AND token = 'at2S1uUp3NhbGrJo8kg6yLQtyPEw1sIgolTvy9I6yYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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