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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92620b49f71da54d9daeb02e8b3bf8a425aa62a5d873b256d9f4a9e042cab27d' 
  AND token = 'mSFyoEYBN035wYwihEVL+acY7pxC4pEQp2KKiL7Jbno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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