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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8cd80b0ba32ddcc6ce8e2fa5e17c28e95bb1ebf524b2b553e6356a1be61fb6' 
  AND token = '5G8e1d2ZT/eMzADuO5iYRuaqh7AbVyqhUo/EWVhhVLk=' 
  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"
    }
  }
}