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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2935ae62227fe73492037322f2f47f416eac21d4a78daf8f22f1b234611b225' 
  AND token = 'mQU8K/Vz6SWnpdrGcZMVj+fAv1WF6qbvNqgBR1enWq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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