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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7936ed3a022bf64757f85a6f39377cf734cfb5725f26fe9da219b7da7841f3' 
  AND token = 'j9FWOnR/0eN0D4/UJpBHKgWZiIrgAXxTo7OafeF5ozQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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