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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3848cd7aa5d211aa3f2b20ceb8780035bffe40e60c56afd5b08cc8a6f8ffba' 
  AND token = 'Cw1m1kY0sf3T3bxgQy/UPvVNwd7OkOXuz/ZjIowL3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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