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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db75c5cc2be50f508b97f5ba300fe8bbb56cde6ef8f61432fb8e4edd75b34f8' 
  AND token = 'WvBG6rKE6fW7w04kRuCTvtqsZXuOaTaXlyaocqzKZPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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