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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48725db541c2543a7da132ed2416c1904b3eaed1ef332d21f7cb690fa6d84f4d' 
  AND token = 'U8wCurxI5JvvdO8G8BSGtFmHNgr0Td0pza4b7D6w4Q8=' 
  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"
    }
  }
}